Vintage 1930's Plastic Rodeo Bucking Bronc Horse Brooch

This little brooch or pin has certainly been well taken care of!  Made of lightweight plastic, that I first thought to be Lucite, but it's not heavy enough.  The back side has a little bit of a light apple juice color and the top has light pearlized finish.  The pin secures with a molded C-clasp, which is also in good shape.  It shows no damage, and only light scuffs, less than expected from a piece 70 years old.  Circa 1930's - 1940's.